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 <h2 class="title">安装</h2>

 <p class="para">使用这些函数不需要安装，它们是 PHP 核心的一部分。</p>

 <blockquote class="note"><p><strong class="note">Note</strong>: 
  <strong>Getting the latest timezone database</strong><br />
  <p class="para">
   The latest version of the timezone database can be installed via PECL&#039;s
   <a href="http://pecl.php.net/get/timezonedb" class="link external">&raquo;&nbsp;timezonedb</a>.
  </p>
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 <blockquote class="note"><p><strong class="note">Note</strong>: 
  <strong>Experimental DateTime support in PHP 5.1.x</strong><br />
  <p class="para">
   Although the <a href="class.datetime.html" class="classname">DateTime</a> class (and related functions)
   are enabled by default since PHP 5.2.0, it is possible to add experimental
   support into PHP 5.1.x by using the following flag before configure/compile:
   <em>CFLAGS=-DEXPERIMENTAL_DATE_SUPPORT=1</em>
  </p>
 </p></blockquote>

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